Sheet-metal piping.



R. T. SEMMES.

SHEET METAL PIPING.

APPLICATION FILED SEPT.19,1911.

1,017,920. Patented Feb. 20, 1912.

II II I I II I I I II I II I I I I RAPHAEL T. SEMMES, OF SAVANNAH,GEORGIA.

SHEET-METAL PIPING.

Specification of Letters Patent.

Patented Feb. 20, 1912.

Application filed September 19, 1911. Serial No. 650,174.

To all whom it may concern:

Be it known that I, RAPHAEL T. SEMMns, a citizen of the United States,residing at Savannah, in the county of Chatham and State of Georgia,have invented certain new and useful Improvements in Sheet Met-a1Piping; and I do hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, forming a part of this specification, and to the figures andletters of reference marked thereon.

This invention relates to sheet metal pipe, particularly stove pipes,and has for its obj ect to provide a seam for such piping which willprevent the expansion of the bottom end of each section of the pipe andthe contraction of the top end, when successive sections are fittedtogether.

To these ends the invention consists in certain novel details ofconstruction and combinations and arrangements of parts, all as will benow described and the particular features of novelty pointed out in theclaims.

Referring to the accompanying drawings, wherein is illustrated thereferred embodiment of the invention, igure 1 is a plan view of a blankof one section of a stove pipe; Fig. 2 is a detail view showing thedouble fold along the edge of the blank; Fig. 3 is a perspective View ofa section be fore being closed; Fig. 4 is a perspective view of acompleted section; Fig. 5 1s a section on line mw, Fig. 4:; and Fig-6 isa section on line 3 Fig. 4.

Similar letters of reference in the several figures indicate the sameparts.

In order to faciligte the fitting together of successive pipe sectionsto secure the proper length of piping the upper end of each section iscrimped and fits within the lower or collar end of the next section.This, as wilf be readily understood, has a tendency to expand the collarend and to contract the crimped end of each section. To overcome thisobjection, according to the present invention, each section of pipe ismade up from a blank A, Flg. 1, of sheet metal or other suitablematerial of proper size and weight, for the particular work for whichthe pipe is intended. On one edge B of this blank are formed or providedlugs or projections, two being shown in the drawings, which preferablyare in the form of right angled hooks 5 6 one of the hooks 6 being end Bof the blank and the other intermediate said hook I) and the top orcrimped end B of the blank.

At the opposite side of the blank a suitable distance from the edge aretwo vertical slots 6 b and above these slots two tongues f, f areformed, extending at right angles to the slots 6 b. The blank along theedge C is bent into a double fold as shown at D, the slots 6 and 6*being so positioned that when the fold D is formed they will lie in thebend (Z of the inner fold. When the double fold is made the tongues f, fextend out from the inner fold as shown in Fig. 2. It will be noted thatthe hooks 12, 6 are not in direct line with the slots 6 b, the ends 12 bof the hooks extending beyond the ends of the slots 6 b In making upeach section of pipe the edges of the blank A are brought together, thehooks 6', 6 being passed through the slots 6 b. Owing to the fact asjust described that the ends or points 6 b", of the hooks extend beyondthe lower ends of the slots 6 b it is necessary in order to pass thehooks through the slots to spring the metal of the blank to permit theends of the hooks to clear the bottoms of the slots. After the hookshave been passed through the slots, the metal will spring back intoplace bringing the edges of the top and bot-' tom of the blank inalinement and also causing the ends 6 b of the hooks to engage the wallof the inner fold just below the bottoms of the slots 6 b and holdingthe bottoms of slots well up in the throats of the hooks. It will benoted that the upper ends of the slots 6 b are open and lead into thespace left by the cutting out of the tongues. By such a construction thehooks can be readily inserted into the slots as they may be raised abovethe open end'of the slot to permit the ends of the hooks to clear thebottom of the slots. To close the open ends of the slots the tongues f,f?, are bent down after the hooks are in place, as shown in Fig. 4:,whereby any tendency of the hooks escaping from the slots is prevented.

When the edges are brought together as just described, the edge B entersbetween the walls of the inner fold of fold D, and lies freely therein.

From the above description it will be seen located near the lower orcollar that when the edges of the blank are locked together, anytendency to expand at the lower or collar end of the section when thecrimped end of the next section is inserted therein, will be resisted,while contraction at the crimped end will be resisted by the edge Babutting against the bend of the inner fold of double fold D.

While two hooks and two slots have been shown and described it isobvious that only one or as many as desired could be employed. Also thatwhile the hooks have been shown as pointing downward they could bereversed and point upward, in which event the ends of the hooks wouldextend above the upper ends of the slots, the tongues, of course, beingat the opposite ends of the slots from those in the previously describedconstruction. Having thus described my invention,

what ll claim as new and desire to secure by Letters Patent, is:

l.-A pipe section having a hook on one edge, a double fold on the otherhaving a longitudinal slot therein open at one end with which the hookcooperates, and means for preventing the escape of the hook from theslot.

2. A pipe section having hooks on one edge, a double fold on the otheredge having longitudinal slots in the inner bend thereof open at one endwith which the hooks cooperate, and tongues adapted to be bent over themouth of the slots to prevent the escape of the hooks.

RAPHAEL T. SEMMES.

Witnesses:

ROY L. RUHL, H. J. MENTZER.

